Possible LM4702 PCB Buy - Page 6

lgreen · 24th June 2006, 12:56 AM

Just emailed to see if there are 2 spare boards; if so i'm also in for the parts.

dfdye · 26th June 2006, 02:46 AM

Quick update:

I have a few more boards left as an FYI since people have been asking.

On the building front, after spending half a day tracking down a variable hum that didn't make any sence and then realizing that my board was too close to my transformers on my bench (duh), I have a few observations to share with folks working on the boards.

If I set the gain too high, I get pretty awful clipping that shouldn't be happening, but it definitely is. I haven't found the sweet spot, but I will let you know when I get there.

Bypassing the input caps hasn't caused me any problems yet.

A simple darlington output pair is extremely easy to wire up p2p, but I haven't tried parallel output stages yet. That's on my to do list.

The descrete stages will have have to wait for a little bit, but I think I have a CFP/Sziklai-Pair that will work well. I'll let you know when I get something solid up and running.

David

Tony · 2nd April 2012, 05:22 AM

any updates?

24th June 2006, 12:56 AM	#51
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	boards left? Just emailed to see if there are 2 spare boards; if so i'm also in for the parts. __________________ My DIY audio projects- PartTimeProjects.com.

2nd April 2012, 05:22 AM	#53
Tony diyAudio Member Join Date: May 2003 Location: Palatiw, Pasig City	any updates? __________________ http://www.electronicslab.ph/forum/i...?topic=32688.0

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26th June 2006, 02:46 AM	#52
dfdye diyAudio Member Join Date: Dec 2005 Location: USA	Quick update: I have a few more boards left as an FYI since people have been asking. On the building front, after spending half a day tracking down a variable hum that didn't make any sence and then realizing that my board was too close to my transformers on my bench (duh), I have a few observations to share with folks working on the boards. If I set the gain too high, I get pretty awful clipping that shouldn't be happening, but it definitely is. I haven't found the sweet spot, but I will let you know when I get there. Bypassing the input caps hasn't caused me any problems yet. A simple darlington output pair is extremely easy to wire up p2p, but I haven't tried parallel output stages yet. That's on my to do list. The descrete stages will have have to wait for a little bit, but I think I have a CFP/Sziklai-Pair that will work well. I'll let you know when I get something solid up and running. David

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